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Question

Which one of the following substances is actively secreted into the glomerular filtrate of the kidney tubule?

A
Potassium ions
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B
Amino acids
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C
Sodium ions
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D
Chloride ions
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Solution

The correct option is A Potassium ions
In the ascending limb of the loop of Henle, there are sodium-potassium ATPase pumps. The sodium ions are extracted from the filtrate and replaced in the filtrate by the secreted potassium ions.
So, the correct answer is option A.

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